Realizing fast photoinduced recovery with polyfluorene-block-poly(vinylphenyl oxadiazole) block copolymers as electret in photonic transistor memory devices

Ender Ercan, Yan Cheng Lin, Chun Kai Chen, Yi Kai Fang, Wei Chen Yang, Yun Fang Yang, Wen Chang Chen

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Photonic field-effect transistor (FET) memory devices offer unique advantages owing to their solution processability, low cost production, and their lightweight and structural flexibility. Despite the plethora of research demonstrated the photon based programming process, limited reports are available for photoinduced recovery mechanism in such devices. To investigate the influence of polymer electret design on photonic memory performance, poly(9,9-dioctylfluorene) (PFO)–block–poly (vinylphenyl oxadiazole) (POXD) conjugated block copolymers were employed to a photonic FET memory with n-type semiconducting channel. The studied device exhibited bistable ON/OFF current states after electrical programming and photoinduced recovery (erasing) processes. The device operating mechanism was elaborated by comparing the device performance with respective electrets of PFO-b-POXD and PFO-b-polystyrene (PS) and PFO homopolymer. We found that PFO-b-POXD can efficiently generate photoexciton under UV illumination to neutralize the trapped hole, and assuage the hole trapping propensity of PFO segment, simultaneously. By optimizing the POXD content in the block copolymer, a decent memory ratio (ION/IOFF) of ~105 was achieved after 104 s, indicating its superior long-term stability and data discernibility. This research shows the judicious strategy to design polymer electret for photonic memory, and it opens up the possibility of developing photonic memory, human perception and futuristic communication systems using simple, convenient and reliable optoelectronic technique.

Original languageEnglish
Pages (from-to)525-537
Number of pages13
JournalJournal of Polymer Science
Volume60
Issue number3
DOIs
Publication statusPublished - 2022 Jan 2

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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